Render a focusable empty state on tvOS Home when no sections have content,
with an "Open Sources" button that switches the sidebar selection. Without
a focusable view the tvOS focus engine had no target, leaving the sidebar
unreachable after the initial iCloud alert was dismissed.
Also wire the selectedSidebarItem onChange handler into the tvOS TabView,
which was missing and prevented programmatic sidebar selection.
Proxied thumbnail URLs from Invidious/Piped/Yattee server expire over
time. Two paths were left holding stale URLs: the Video Info carousel
kept the original list copy even after fresh details arrived, and
downloaded videos rendered from the remote URL snapshot taken at
download time while the local thumbnail on disk was ignored.
Evict stale URLs from the Nuke cache when fresh video details load,
pass the fresh details through to the videoCard thumbnail, and resolve
downloads' thumbnails from the local file when localThumbnailPath is
set.
Render section headers as plain Text on tvOS so the focus engine
skips them and moves directly between video cards across sections.
iOS and macOS keep the tappable Button with chevron unchanged.
Introduces a "Display sections as" picker in Home settings with List and
Grid modes. Grid renders each section as a horizontal shelf of video
cards, defaulting to Grid on tvOS and List on iOS/macOS. Per-platform
defaults are preserved via a platform-specific settings key.
On tvOS the shelf is a focus section so swiping up/down between rows of
different lengths works without getting stuck at the end of a row.
Post watchHistoryDidChange notification when a new watch entry is inserted
during local playback progress updates (but not on every progress tick).
Reload Home data when switching back to the Home tab and when the Customize
Home sheet is dismissed.
